Inaudible Voice Commands: The Long-Range Attack and Defense | USENIX

["Dave Farber" <farber () gmail com>]

https://www.usenix.org/conference/nsdi18/presentation/roy

Inaudible Voice Commands: The Long-Range Attack and Defense
Authors: 

Nirupam Roy, Sheng Shen, Haitham Hassanieh, and Romit Roy Choudhury, University of Illinois at Urbana-Champaign

Abstract: 

Recent work has shown that inaudible signals (at ultrasound frequencies) can be designed in a way that they become 
audible to microphones. Designed well, this can empower an adversary to stand on the road and silently control Amazon 
Echo and Google Home-like devices in people’s homes. A voice command like "Alexa, open the garage door" can be a 
serious threat.

While recent work has demonstrated feasibility, two issues remain open: (1) The attacks can only be launched from 
within 5 ft of Amazon Echo, and increasing this range makes the attack audible. (2) There is no clear solution against 
these ultrasound attacks, since they exploit a recently discovered loophole in hardware non-linearity.

This paper is an attempt to close both these gaps. We begin by developing an attack that achieves 25 ft range, limited 
by the power of our amplifier. We then develop a defense against this class of voice attacks that exploit 
non-linearity. Our core ideas emerge from a careful forensics on voice, i.e., finding indelible traces of nonlinearity 
in recorded voice signals. Our system, LipRead, demonstrates the inaudible attack in various conditions, followed by 
defenses that only require software changes to the microphone.






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